/**
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.aliyun.encryptionsdk.kms;

/**
 * {@link BackoffStrategy} 默认实现
 * 处理了每次重试需要等待时间的具体算法
 */
public class FullJitterBackoffStrategy implements BackoffStrategy {
    private long retryInitialIntervalMills;
    private long capacity;

    public FullJitterBackoffStrategy(long retryInitialIntervalMills, long capacity) {
        this.retryInitialIntervalMills = retryInitialIntervalMills;
        this.capacity = capacity;
    }

    @Override
    public long getWaitTimeExponential(int retryTimes) {
        return Math.min(capacity, (long) (Math.pow(2, retryTimes) * retryInitialIntervalMills));
    }
}
